president obama had been hurt. the dow dropped suddenly, losing nearly 150 points, then quickly recovered. as much as $136 billion, by one insider's estimate, may have changed hands. the reason, high frequency computer trading. >> the dow only moved down 1%. that's not big enough to hit those alarm bells and the safeguards. >> there doesn't seem to be sufficient safeguards on twitter accountings, which quickly distribute bad information. >> it's too easy to hack anything. they are still relying on simple passwords. >> c net writer says while twitter is protected legally, it's untrust were thy and headed toward a tipping point. >> they have to be trustworthy. they'll stop reading twitter and that's a problem for their business. >> twitter declined to talk with kpix5 saying it doesn't comment on individual accounts. the associated press says it is cooperating with twitter to investigate the hackers. >> it does start to get scare yes when the goal is to spread misinformation. you have to wonder if the hackers profited